Evolution of defect substructure of metal alloys at microscopic and mesoscopic level under torsion |
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| Authors: | A N Tyumentsev Yu P Pinzhin M V Tretjak A D Korotaev I A Ditenberg R Z Valiev R K Islamgaliev A V Korznikov |
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| Institution: | a Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, 634021 Tomsk, Russian Federation;b Siberian Physicotechnical Institute, 634050 Tomsk, Russian Federation;c Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 450000 Ufa, Russian Federation |
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| Abstract: | Transmission electron microscopy was used to investigate the reorientation of crystal lattice during the formation of ultrafine-grained (UFG) copper, nickel, and an alloy of Ni–18% Al–8% Cr–1% Zr–0.15% B (at.%) under severe plastic deformation by equal-channel angular (ECA) pressing and twisting at a high quasi-hydrostatic pressure. The crystal lattice was found to transform into a UFG state; it is fragmented at the nano-, micro-, and mesoscale levels. Possible mechanisms for the reorientation of the crystal lattice under deformation at the micro- and mesoscale level are discussed. |
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| Keywords: | Severe plastic deformation Ultrafine-grained state Scale levels of deformation Disclinations Crystal lattice curvature Fragmentation Electron microscopy |
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